On Wednesday 10 January 2007 06:02, Sten Heinze wrote:
> Thanks for your immediate answer. It helped me solving the problem, and the
> following is just for information.
>
> Am Mittwoch, 10. Januar 2007 00:58 schrieb Blaisorblade:
> > On Tuesday 09 January 2007 17:05, Sten Heinze wrote:
> > Sorry, post at least the output of linux --version (i don't have an idea
> > if it is a 2.4 or 2.6 one).
>
> I assumed that my UML guest is the last user-mode-linux deb package is
> enough, sorry, but to be exactly:
> $ linux --version
> 2.6.18
> $ apt-show-versions |grep user-mode-linux
> user-mode-linux/testing uptodate 2.6.18-1um-2

> With the knowledge of the working Fedora rootfs I downloaded the Fedora UML
> guest from http://user-mode-linux.sourceforge.net/new/ (same location where
> this rootfs is from) and tried to boot it:
>
> host kernel without skas-patch:
> $ cat /proc/version
> Linux version 2.6.18.5-sh-pentiumm ([EMAIL PROTECTED]) (gcc version 4.1.2
> 20061028 (prerelease) (Debian 4.1.1-19)) #1 SMP PREEMPT Tue Dec 12 10:26:27
> CET 2006
> $ ./linux-2.6.19-rc5 ubd0=FedoraCore5-x86-root_fs
> [...]
> Checking for the skas3 patch in the host:
>   - /proc/mm...not found
>   - PTRACE_FAULTINFO...not found
>   - PTRACE_LDT...not found
> UML running in SKAS0 mode
> Linux version 2.6.19-rc5 ([EMAIL PROTECTED]) (gcc version 4.1.1
> 20060525 (Red Hat 4.1.1-1)) #24 Wed Nov 8 12:05:48 EST 2006
> [...]
> VFS: Mounted root (ext3 filesystem) readonly.
> mapping mmap stub failed, errno = 12
> Kernel panic - not syncing: start_userspace : expected SIGSTOP, got status
> = 256

This should never happen - which is the host kernel? grep for VMSPLIT and VDSO 
on the host config file and post the result, please - we need info to fix 
such stuff.
Jeff, do you know anything about these?

> host kernel with skas-patch:
> $ cat /proc/version
> Linux version 2.6.18.5-sh-pentiumm-skas3-v9-pre9 ([EMAIL PROTECTED]) (gcc
> version 4.1.2 20061028 (prerelease) (Debian 4.1.1-19)) #1 SMP PREEMPT Sun
> Jan 7 23:48:13 CET 2007
> $ ./linux-2.6.19-rc5 ubd0=FedoraCore5-x86-root_fs
> [...]
> Checking for the skas3 patch in the host:
>   - /proc/mm...found
>   - PTRACE_FAULTINFO...found
>   - PTRACE_LDT...found
> UML running in SKAS3 mode
> Linux version 2.6.19-rc5 ([EMAIL PROTECTED]) (gcc version 4.1.1
> 20060525 (Red Hat 4.1.1-1)) #24 Wed Nov 8 12:05:48 EST 2006
> [...]
> VFS: Mounted root (ext3 filesystem) readonly.
>
> Again, this hung with 100% cpu usage on the host. Same result if I try to
> boot the Fedora rootfs with the Debian UML guest. Booting root_fs gives:
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(98,0)

-- 
Inform me of my mistakes, so I can add them to my list!
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
 http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com 


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